John Piper is founder and lead teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. He served for thirty-three years as a pastor at Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than fifty books, including Desiring God; Don’t Waste Your Life; and Providence. Justin Taylor (PhD, The Southern Baptist Theological Seminary) is the executive vice president of book publishing and book publisher at Crossway. He has edited and contributed to several books, and he blogs at Between Two Worlds—hosted by the Gospel Coalition. Justin Taylor (PhD, The Southern Baptist Theological Seminary) is the executive vice president of book publishing and book publisher at Crossway. He has edited and contributed to several books, and he blogs at Between Two Worlds—hosted by the Gospel Coalition. John Piper is founder and lead teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. He served for thirty-three years as a pastor at Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than fifty books, including Desiring God; Don’t Waste Your Life; and Providence. Mark Talbot (PhD, University of Pennsylvania) is an associate professor of philosophy at Wheaton College and the host of the When the Stars Disappear podcast. He is also the author of the Suffering and the Christian Life series, including When the Stars Disappear and Give Me Understanding That I May Live. He and his wife, Cindy, have one daughter and three grandchildren. David Powlison (1949–2019) was a teacher, a counselor, and the executive director of the Christian Counseling & Educational Foundation. He received his PhD from the University of Pennsylvania and was also the senior editor of the Journal of Biblical Counseling. He wrote a number of books, including How Does Sanctification Work?; Making All Things New; and God's Grace in Your Suffering. Joni Eareckson Tada is CEO of Joni and Friends, a global ministry that serves the practical and spiritual needs of people with disabilities. She is also an artist and the author of numerous bestselling books, including Joni; A Place of Healing; and When God Weeps. Joni and her husband, Ken, reside in Calabasas, California.